This morning, Google kicked off the release of April’s security patch by pushing out factory images of the update for supported Nexus devices. As of right now, we are seeing new images for the Nexus 6P, Nexus 5X, Nexus 6, Nexus Player, Nexus 9 (WiFi and LTE), Nexus 5, Nexus 7 (2013, WiFi and LTE), and Nexus 10.
Nexus 6P and 5X are seeing Android 6.0.1, build “MHC19Q,” while the Nexus 6, Nexus 9 (LTE), Nexus 7 (2013, LTE), and Nexus 5 are getting “MMB29X.” The Nexus Player, Nexus 9 (WiFi), and Nexus 7 (2013, WiF) are getting “MOB30D.” In addition, the Nexus 10 is seeing Android 5.1.1 “LMY49J.”
You can grab each image at the link below. For instructions on how to flash a factory image, here you go.
Factory Image Link
UPDATE: The April 2016 Nexus security bulletin is now available, should you be curious as to what was patched this month.